| 摘要 |
PURPOSE:To prevent the substrate from blasting, by adding a fibrous material which is dissolved in water, when the substrate is heat-dried or exposed to high temperature, to a refractory composition in which the crude particles and the fine particles are separately fed to the spraying nozzle at a specific ratio. CONSTITUTION:The subject refractory composition is composed of (A) the crude particle fraction comprising 100pts.wt. of crude refractory particles of 3mm-74mu sizes, 0.05-1.0pt.wt. of a fibrous material soluble in warm water over 50 deg.C, of 0.1-20mu diameter and 1-5mm length and 0.1-1.5pt.wt. of a curing agent, and of (B) the fine particle fraction comprising 100pts.wt. of the refrac tory particles of less than 74mu sizes, a colloidal silica solution of 20-30wt.% solid content and water in a slurry form. The crude particles are directly, the fine particles are made into a slurry on site, then they are separately forced to the nozzle where they are mixed at a prescribed ratio and sprayed to the substrate. When sprayed substrate is heated, and the temperature exceeds 50 deg.C, the fibrous material is dissolved in water and colloidal silica dispersion, until it dissipates and air-permeating pores are formed to inhibit blasting. |
